PARASITES OF MAN. 68 
ne aedad tt SIE ESN EnNSSnESnESS RRS 
tion of sexual maturity after the larvee have gained access to 
the body of the ultimate bearer. The bearer may be either man 
himself, or it may be a cat, dog, lion, or some other feline 
carnivore. 
Inter. Host.—Not necessary. 
Exper.—Leuckart and others have made direct. feeding-experi- 
ments with the ova, but they have always been attended with 
negative results. 
Remarks.—The determination of the identity of this worm 
with Bellingham’s Ascaris alata rests with myself. In this 
matter I had to oppose the great authority of my respected 
friend and senior, Professor Leuckart, and I had also to over- 
come the opposition of Kiichenmeister, who sought to throw 
doubt on Bellingham’s original discovery, characterising the 
so-called Ascaris alata as merely a young worm, ‘if indeed,” he 
added, “it were a worm at all.” At length, due acknowledg- 
ment of the correctness of my views has been made; and no 
less than seven instances are now on record of the occurrence of 
this parasite within the human body. Historically, this 
entozoon possesses a special interest in the fact that it supplied 
Dr. Henry Nelson with the data on which his remarkable 
thesis was based. In this thesis an important advance was made 
in reference to our knowledge of the embryogenetic process 
undergone by the nematodes. 
Lit.—Bellingham, Dublin Journal, 1839; Nelson, Phil. Trans., 
1851-52; Heller (l. c., s. 361;) Cobbold, Lancet for January, 
18638, and in “‘ Entozoa,” p. 316, et seq. 
42.—Ascaris maritima, Leuckart.* 
Syn.—None. 
Larvee.— Unknown. 
Exxper.—None. 
Remarks.—A solitary sexually immature specimen supplied 
Leuckart with the means of determining the existence of this 
worm as a distinct species. It measured about 13 of an inch in 
length. The specimen was discovered in April, 1865, by Dr. 
Pfaff, at Jacobshavn, near Godhavn, West Greenland. It had 
been ejected from the mouth by a child. 
Lit.—Leuckart, Die menschlichen Parasiten, Bd. IL., s. 877. 
[vO BE CONTINUED. | 
HARDINESS IN PLANTS. 
BY F. T. MOTT, F.R.G.S. 
W. E. (p. 53) asks the interesting, and not very easily answered 
question, ‘‘ What is the cause of hardiness in plants?” The subject has 
been partially investigated by several German botanists, and a good 
, * When in the introductory remarks prefixed to my former communication 
I spoke of only “ five more human nematodes” as remaining to be noticed, I had 
forgotten this comparatively unimportant species.—T. 8. C. 
