11 
my own l . Both of us eagerly took up the study of the 
different branches of natural science, and continued 
our investigations with unabated vigour and zeal until 
such time as we were, either of us, forced to confess 
that the other had outdistanced us, whereupon, acknow- 
ledging our defeat, we left the field to the more suc- 
cessful combatant in the struggle. Thus, after protract- 
ed labour to attain premier position in the department 
of Ichthyology, I was finally fain to admit my inferior- 
ity to my rival, and thenceforth I left that subject 
entirely in his hands, as also the study of Amphibia 2 , 
while, on the other hand, he willingly acknowledged 
that I was ahead of him in knowledge of Birds and 
Insects. In Mineralogy and the study of Quadrupeds 
(Mammals), again, we kept fairly abreast of each other." 
"Every observation which the one of us succeeded 
in making earlier than the other, gave occasion to a 
brief pang of a species of jealousy and prompted each 
to the keeping secret of such discoveries for the future; 
but the mutual feelings of genuine friendship and ad- 
miration we entertained, rendered those momentary re- 
solves of none effect, and the daily intercourse we had 
together derived much of its raison d'etre and value from 
the open-hearted way in which we communicated to one 
another the results of the researches we were making." 
"The rivalry between us encouraged us in our ef- 
forts and spurred us on to greater industry and dili- 
gence in our work. Not a day passed without one of 
us going to see the other, and that, though the distance 
between our dwellings was somewhat great. We re- 
ported to each other unreservedly whatever happened 
to us, whether it was of a joyous or sorrowful nature. 
In that wise we each derived the sweet consolation of 
possessing a true companion and a sympathiser in all 
1 In another place this statement is qualified by the note that 
ARTEDI reserved himself the right of still studying the Umbelliferae, 
for he intended to work out quite a new method of treating them. 
2 According to the nomenclature of that day, the Amphibia 
embraced both Reptilia and Batrachia. 
