4893.] Psychology. 67 
daws (Corvus monedula) come every day, at the exact hour, never too 
soon, never too late, from the towers of the Chapel of the Lyceum, an 
old church of the Jesuits, to snatch from me, or from any one who 
takes my place, the bits of meat that we give to the gulls. 
“Last year a dwarf hen which belonged to me chased from its nest 
a female pigeon which had been setting for two days, broke up the 
eggs, and laid one of its own in the nest. The pair of pigeons contin- 
ued to care for the egg of the hen, and, at the end of twenty-one days 
(which was really twenty-three for the pigeons) the chick came out of 
the shell. To see the efforts of the parents to feed it was curious. The 
second day, seeing that their efforts were in vain, I gave it some moist- 
ened bread, then I put it under the pigeon; so matters went on for 
three days, but the chicken wished to run about and I was obliged to 
take it from its adopted parents.”—Bull. Soc. Zool., No. 4, 1892. 
A Nest Building Frog.—In your issue for May, 1889, page 
383, you published a paper in reference to certain batrachian nests 
discovered by me at Nikko in Japan. This summer I was shown by 
Dr. Guenther, at the British Museum, a couple of similar structures, 
though very much smaller in size, preserved in alcohol, and which had 
been received by the Museum from Japan. One of them had been 
taken from a shrub growing in the mouth of a well. Dr. Guenther 
told me that this nest is referable to a species of Polypedates. Day 
before yesterday I received a letter from my friend, Dr. A. C. Good, 
who is at present conducting a series of explorations in German West 
Africa. I take the liberty of transcribing a portion of the letter as 
follows: 
“ I desire to write you of something I saw on my last trip. As we 
brushed against the bush, that frequently overhung our path, I several 
times noticed, now on my shoe, now on my knee, a white froth. I 
thought it belonged to some insect, but for a long time I only noticed 
the white foam-like substance when I had gotten past the bush from 
which I had brushed it. 
“ At length, however, I brushed off a large bunch of substance, and 
when I tried to brush it from my clothes I uncovered some small crea- 
tures which wiggled about in it and evidently made this froth-like 
matter their home. On closer examination I discovered, very much 
to my surprise, that they were tadpoles. ; 
« Later on I found on the underside of a leaf, a mass of this white 
substance that had not been disturbed since it had been placed there 
by the mother frog. I take it for granted that these tadpoles produce 
