EELWORMS. 
5 
“ Sometimes I observed a few specimens of an Aphelenchus modestus , 
but these are not the cause of the disease in this case. 
“I will add that the fungus spores are oval, and are 0*005 to 
0.006 mm. long. The eggs of T. devastatrix are also oval, and are 
0.07 to 0*08 mm. long.” 
On April 25th Dr. Bos wrote me that in the plants I sent him on 
the 20th inst. out of Kent (of which I wrote that they were certainly 
true specimens of the state of disease known as “Clover-sickness”), 
he found several Tylenchi, male, female, and eggs. “ The short 
branches were irregularly thickened, and, in short, these Clover plants 
showed the greatest resemblance possible in their condition to that of 
other attacked plants which I know to have been caused by Tylenchus 
devastatrix .” Dr. R. Bos mentioned that he found in the “ sick ” 
plants, and especially in the decaying parts, a few Eelworms of other 
kinds, but these were in such small numbers that there could be no 
doubt as to which were the origin of the “ Clover-sickness.” 
On April 29th Mr. Whitehead wrote me, from Banning, that he 
had forwarded fresh specimens of “ Clover-sick” plants, in which he 
considered he himself could discern the Tylenchi , to Dr. Ritzema Bos, 
who, after examination, sent him the following reply, which I am 
permitted to insert:— 
“I have yesterday received your packet with Clover-sick plants, 
and I have found in them, especially in the tops of the branches and 
the buds, a great quantity of the males, females, larvae, and eggs of 
Tylenchus devastatrix, the same Nematoid worm which is the cause of 
the ‘ Stockkrankheit ’ of the Rye and Buckwheat in Germany and the 
Netherlands, and very probably of the Tulip-root in Oats. You will 
oblige me very much by informing me whether the foregoing crop was 
Tulip-rooted Oats. Miss Ormerod has sent me Clover plants (Clover- 
sick) from land where previous Oat crop was destroyed by Tulip-root, 
and I found a great quantity of Tylenchi in them.” 
In the course of the latter part of April and beginning of May 
Mr. John Elder, of The Holmes, Uphall, Linlithgowshire, forwarded 
me specimens of Clover plants which he had noticed were not thriving 
when he was top-dressing the field a fortnight before. “ They were 
worst on the portions which failed through Tulip-root last year when 
in Oats.” 
The mixture applied was sulphate of ammonia, four parts ; steamed 
bones, two parts ; sulphate of potash, one part. One and a half cwt. 
of the mixture per acre. 
Specimens of these were forwarded to Dr. Ritzema Bos, in some of 
which he found decided infestation. Dr. Bos wrote me :—“ In Nos. 3 
and 4 I found Tylenchi in a considerable number; males and females, 
larvae and eggs. In No, 3 I found a great number of Tylenchi in the 
