I found this at paganart.com:

Song of Amergin: Line by Line
This was an article feature in Spellcraft Taprestries (sic)
Volume 1, Issue 4

The Celtic tree calendars is one of favorite devices keeping the year in a pagan perspective, a reminder of the cycles of nature, when the modern world wants us to ignore nature. When I first started learning about paganism and celtic mythology, I stumbled across the Celtic Tree Calendar. Most of the information on the calendar was vague at best, just enough to give the general layout of calendar and the dates for the months. People also mentioned that Robert Graves had made fabricated the calendar. If you read "The White Goddess you realize that the tree calendar is not based on historical fact but the interpretation of epic poetry. Robert Graves compared poetic themes and motifs that occured repeatly and were adhered to over time and different cultures. Hidden in the poetry he saw a yearly cycle, a calendar.

One of Graves most important sources for the Celtic Tree Calendar is the Song of Amergin, an early celtic poem that was uttered by the chief bard of the Milesians as he set foot upon Ireland. I have seen the Song of Amergin posted all over the web and reprinted in many books, but never any explanation of how the poem and the calendar relate to each other.

The poem is divided into two stanzas of seven lines. All are statements that start with I am expect of the final line which asks a question. The first stanzas relates to the first have of the year. Graves give the follow relationships:

1. I am the stag of seven tines: the letter B or beth, refers to the Birch tree. This line refers the Herculean stag of seven tines. In some versions it is bull of seven fights. Historical the stag and bull have meanings that and are often interchangeable. This is the begin of year.

2. I am a wide flood on a plain: the letter L or Luis and refers to the Rowan tree or Quickbeam. Simple the months of floods or rain, also called the fill dyke month.

3. I am a wind on the deep waters: the Letter N or Nion the Ash tree or World tree in Norse Mythology. It comes in like a lion, with the roaring of the wind that dries the floods.

4. I am a shining tear of the sun: the Letter F or Fearn or the Alder tree. Graves states the is Fearn is best explained by the a medieval carol:

He came all so still
Where his mother was,
Like dew in April
That falleth on grass.

5. I am a hawk on a cliff: the letter S or Sallie refers to the Willow tree and is the month when birds come to nest. The bird most often associated with this month is the hawk. Welsh court bards often referred to their patrons as hawks a symbol of the north wind.

6. I am a fair amongst flowers: the letter H or Uath or the hawthorn tree, starting in the second half of May is the season of flowers and the Hawthorn or May Tree rules.

7. I am a god who sets the head afire with smoke: the letter D or Duir refers to the Oak tree. Robert Graves said" The mean is I think, that the painful green smoke gives inspiration to those who dance between the twin sacrificial fires lighted on midsummer Eve."

The second stanza is the last half of the year.

8. I am the battle-waging spear: the letter T or Tinne the Holly tree. It is the spear month, the month of the tanist, The letter t was shaped like a barbed spear.

9. I am a salmon in a pool: the C or Coll, the Hazel tree. It is the nut month. It is the mating season for salmon and the salmon is king of the riverfish. A salmon in a pool is an emblem of philosophical retirement.

The next three months are not trees but plants related to the harvest, and the coming of winter.

10. I am a hill of poetry: the letter M or Muin refers to grape vine and the harvest. The grape vine is the prime tree of Dionysus. Wine is universally associated with poetic inspiration.

11. I am a ruthless boar: is the letter G or Gort and is ivy. It is the month of the boar. The egyptian god Set disguised himself as a boar to kill Osiris of the Ivy. October was the traditional boar hunting season . The boar is the beast of death and October is the begin of the fall of the year (Samhain).

12. I am a threatening noise from the sea: the letter NG or Ngetal and represents the reed or what was commonly called broom. This is the month when the terrible roar of the breakers and the snarling noise of the pebbles is heard on the Atlantic coast and the wind whistles dismally through the reed-beds of the rivers making a sound reminiscent of Pans flute. In Ireland the roaring of the sea was prophetic of the kings death.

13. I am a wave of the sea: the letter R or Ruis the elder tree. This is the month when the waves returns to the sea and the year ends start back at it's watery beginnings. In Irish and Welsh poetry "A wave of the is called the "sea-stag" relating the first line of "I am the stag of seven tines".

14. Who but I knows the secret of the unhewn dolmen?": This was Robert Graves key to the arrangement of the alphabet. Why?

The alphabet is best explains itself when built as a dolmen of constants and threshold of vowels. But we'll save that explanation for next issue.

Secret of the Unhewn Dolmen

*kat here: I'll go back and see if I can find the rest of this. Also found another verse. Will be back in a mo'.