378 
CHAPTER of criticism, 
two very fine Walnut-trees, little risings of moisture, like small springs issuing 
from the Gravel. Between the trees* about twenty feet from each, one much 
larger than the rest induced me to ascertain the cause, when, on digging down 
about eighteen inches, I found the bark of the root had given w r ay, and the sap 
was rapidly oozing out. I counted from the two trees no less than nine springs, 
some more copious than the others, yet all flowing freely. On Sunday the spots 
were still very moist, but did not show signs of being on the increase. Can you 
oblige me, in one of your future numbers* by stating a remedy for this dangerous 
draining of two fine old useful and ornamental friends ? 
As a constant reader and admirer of your periodical, I take the liberty of 
forwarding you the preceding communications. Should they be worthy a place 
in the pages of The Naturalist , I shall feel pleasure in having added a mite to so 
excellent a Journal. Should they be considered inadmissible, I must request the 
favour of your pardon, and with all due submission subscribe myself as 
Yours, most respectfully, 
Stoke Ferry, Norfolk , Richard Pigott. 
May 14, 1838. 
[The eruption alluded to as observed in the trunks and roots of the Walnut- 
trees, probably arises from a disease scarcely to be subdued by local applications, 
a method, however, which would be as well tried, since no harm could ensue. 
An adhesive fluid or plaister might answer the purpose, but it is impossible to 
supply definite information on this head without inspecting the invalids. We 
should be glad to learn the experience of any correspondent in the matter.—-For 
the above interesting communications we beg to return thanks, and to express a 
hope that Mr. Pigott will become a frequent contributor to the pages of The 
Naturalist.— 
CHAPTER OF CRITICISM. 
Or the Formation of Pearl. 
To the Editor of the Naturalist. 
Doncaster , May 17, 1838. 
Dear Sir, —At the conclusion of a very interesting lecture by Mr. Edwin 
Lankester, at our Lyceum, the chairman, Mr. Morey, complimented him on 
its originality, and in particular for the novelty and importance of his remarks 
