Rec'd July 20th 
Ans’d Aug. 17th At sea between the Galapagos Islands 
and Panama 
June 20th 1872 
My dear Engelmann, 
I have just packed a box of Cactus for you, collected 
at the Galapazos which I hope to be able to forward in Panama. 
The Cereus is from Indefatigsable Island, as is also the more 
spiny Opuntia; the larger and less spiny (spinous) species is 
from Jarvis Island. Wether they are truly two species I am 
not sure;I can only say that upon Abermarle Island I only saw 
the spiny form and so was it also the only one upon Indefati - 
gable Island, while on Jarvis and Charles Islands only the less 
spiny form occured. Upon Varvis Island I also noticed the less 
spiny species. Cereus does not seem to differ among the islands; 
at least not amonez the four larger islands which we visited. I 
saw none upon Jarvis. I trust the specimens which I sent to 
Cambridge may be forwarded without delay and reach you in good 
condition. 
Three or four months ago I forwarded another box contai- 
ning Cactus from the Mount or Serro of Montevideo, and one 
‚species of Cereus of the largest specimen in the box from the 
cliff of St. Mathias Bay in East Patagronia. 
I wanted very much to collect specimens for you in Chile 
and Peru, but my opportunities were not favorable., 
With kindest remembrances to Mrs. Engelmann from me and 
Mrs. Agassiz best wishes for the young Doctor, . 
Ever truly yours 
L. Agassiz 
Dr. George Engelmann 
St. Louis 
transcribed from handwritten letter by Edear Derison. 
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