Astronomy and Meteorology. ~ 363 
organ for the transformation, and in a degree independent of the nurse, 
and hence spoken of as spontaneous. The first of the groups 
above comes under the head-of alternate genesis—Generationswecksel 
while the second, and in part the third, are instances of parthenogen- 
esis. From this point of view, also, is the present case intermediate 
between the first and second groups. 
- He calls attention to the compensation, by the budding of the larve, 
for the limited egg-bearing capacity of the mature fly, and regards this 
compensational balance as usual in these cases. Also, considering the 
into these larves—a view confirmed, it will be remembered, by Dr. 
Meinert—he points to the hypertrophied eggs as a store of material for 
its production. That this granular substance is of a nutritive nature, is 
made altogether probable by its transference into the stomach through 
the Malphigian vessel, in cases of prolonged abstinence, and also by the 
presence of sugar in it; and he observes that the imperfect tracheal 
system and sluggish movements, for a time at least, of the larve-nurse 
tend to leave this store intact for the sole use of the buds. 
_ Both in this, and the first paper of Dr. Wagner’s, which we have 
glia of the larve, the valves at the posterior end of the dorsal heart— 
alo figured by Dr. P 
ong its side, supposed from analogy—in leeches—to form the blood 
corpuscles, we have ourselves seen. ’ 
It is perhaps not premature to state here that the writer has found a 
Ano, Jr. Part IL 66 pp. 8vo. From the Proceedings of the Ento- 
Mological Society, Philadelphia. Nov. 1864. 
IV. ASTRONOMY AND METEOROLOGY. 
1 . 
and note 41 (this Jour., [2], xxxix, 81, 32), I have committed an error 
M my reference to Prof. Ferrel’s article on the retarding effect of the 
