Ree,. April 2 

 Ans. Feb. 12,1880 

 Apr. 11, 1880 



Tubingerr, A ' A arch ll,,l8?8 



Most Honored Friefid 



I am since several weeks in possesion of your Communications 



of the lOth of the pre Gerling month ; , for which I thank raost devotedly,. 



as well as for the letter with enclosures and the printed matter. I 



do not und erstand however, how you could think to be owing to me, 



rather, I did not let hear of myself for ajLong time, as my efforts 



have been interrupted several times through exterlor circumstances; 



I am just now occupied,to prepare the illustrations for a series of 



embryological examinations, which you will reeeive during next fall ,, 



if the publication takes place.. It is generally known, that the deve- 



lopment of the enbryo has progressed very little by the time of seed? 



maturatiorr, and Starts again only later. With a few varieties there 



exists a mature embryo. First from only a few cells, in other cases 



it develops at least into the cotyledonyin seeds, that have fallen,, 



or during germinatiorr it is not quite apparent, as happens somewhat 



similarly with your Erigenla . — You sent me two samples of Lemnaceae . 



The one contains the f requently f ound forms from there, specially rauch 



Wolf f la gladiata ; That from Florida (Gäinesville Nov. 177) is of inte- 



rest for the Flora of the UnitÄd States, because it too contains 



Wolf f ia gladiata ,, which. up to now, was only known from the environ- 



ment of Mexico City (tauch, , you will be able to see the green,narrow 



bands without (Stissecting with the bare eye) ; . besides however Lemna 



pol yr r hi za . val d 1 vi ana and minor. . Pigmentati on of the epidermis is 



entirely 



x^ith the Wolffia of the latter kind, otherwi se it is xxxxxxkxmwikT' 

 identical with that from Mexico.. 



If, in any future, you get the time to deal with your treasures, 

 I would be most oblisred for a friendly consideration. . 



|iiii|iniU ^ 









1 2 3 4 5 

 cm 



e 



7 8 9 10 Missouri 

 botanical 



