EXTRACTS OF PROCEEDINGS. 
XXXVll 
Woolman, of Bedford. The tree which produces these double 
apples is fifteen or sixteen years old, and has always produced the 
same peculiarly formed fruit, the entire crop being thus affected. 
Abnormal Fungi. —Mr. W. G. Smith exhibited specimens of 
Agaricus furfuraceus, with the exact external aspect of a Morel. 
The fungi were found under an Oak in a field at Henbury, Bristol, 
by Mr. Cecil H. S. Perceval. The plants were growing upon the 
ground and upon chips, and were at first supposed to be small 
Morels. They, however, grew in company with Agaricus furfura- 
ceusy and every intermediate form was found between the normal 
and abnormal forms of the Agaric. Cases of this nature are some¬ 
times referred to mimicry or protective resemblance, but although 
the resemblance to a fungus totally different from itself is precise in 
this instance it is difficult to see what end, if any, could be served 
by such mimicry. 
Composition of Potatos.—Dx. Gilbert made some very interesting 
remarks on the subject. He said that Mr. Lawes and himself had 
been for two years experimenting on the effects of different manures 
on the Potato, and they had obtained a variation in the amount of 
produce from something over three tons without manure to nearly 
nine tons with the highest manure. Samples of the different crops 
had been analysed in the usual way; and a great difference in the 
composition of the tubers was found. There was a difference of 
several units per cent, in the amount of dry or solid matter; there 
was about one and a third time as much mineral matter in some as 
in others; and there was nearly twice as much nitrogen in some 
as in others. 
It occurred to them that it would be interesting also to examine 
the tubers somewhat in the way adopted in the case of some root 
crops, such as sugar beet ; that is, to express, and determine the 
composition of the juice. 
It was found that by far the largest proportion of both the 
mineral matter and the nitrogen of the tuber existed in the 
clear filtered juice; and there was as striking a variation in the 
per-centage of these in the juice as in the whole tubers, depending 
on the character of the manure, and on the amount of crop. 
It was remarkable, too, that some of the largest crops, which, 
judging from the withered condition of the tops, must be con¬ 
sidered fairly ripe, nevertheless contained a juice relatively very 
rich in nitrogen. 
His special object in referring to these experiments was, how- 
