1014 The American Naturalist. [November,. 
mined by tendencies in the ovary, tendencies which may vary from 
connection with different males, from food, temperature, etc. To 
bring about a variety in the species, all the males of which might be 
rights, or all lefts, the females to suit, choice would have to be made of 
individuals actually producing the required forms, and of particular 
conditions, in a measure disregarding the right or left of the parents. 
And this introduces a great many complications into the selection 
problem. Another question of interest relates to the origin and devel- 
opment of the unusual features. Some light is thrown upon this by an 
allied genus in the family, of which the males alone appear to be rights 
and lefts. Excepting these genera, no other creatures are recalled 
that are in the particulars under notice similar to these peculiar fishes.. 
Though less extravagant, the species of Anableps are suggestive of the 
fanciful birds in the stanza translated by Moore, as he tells us, from 
the Persian, alluding to the “ Jaftak,” “a sort of bird that is said to 
have but one wing, on the opposite side to which the male has a hook, 
and the female a ring, so that when they fly they are fastened 
together: ” 
“ How can we live so far apart ? 
Oh, why not rather heart to heart, 
United live and die, 
Like those sweet birds that fly together, 
With feather always touching feather, 
Linked by a hook and eye!” 
—S. GARMAN. 
The Bats of Cuba.—Of the twenty species of bats observed by 
Dr. Gundlach in Cuba, nineteen have been recorded by him in his 
paper entitled “Contribucian á la Mamalogia Cubana.” He places 
them in two groups, as follows: I. Species with a nose-leaf or with 
fleshy wrinkles over the nostrils or around the mouth. They hang 
themselves during the day by the hind legs. They eat insects and 
fruit. The following genera are included: Macrotus, Monophyllus, 
Phyllonycteris, Artibeus, Phyllops, Brachyphylla, Mormops, Chilonyc- 
teris, Noctilio. II. Species without a nose-leaf and with no wrinkles 
about the mouth. These sleep in crevices and do not hang themselves 
by the hind feet. They eat only insects. The following genera are 
included: Molossus, Nyctinomus, Natalus, Vesperus, Nycticejus, 
Atalapha. (Abstr. Proceeds. Linn. Soc. New York, No. 7, 1895.) 
Fatigue and Toxicity.—A series of experiments carried on by 
M. Redon show the toxicity of the blood of cattle that have died of 
