282 QUARTERLY CHRONICLE. 
in diameter. RR. repens, round and smooth, and 1th of an 
inch in diameter. A. bulbosus, round and smooth, and —1,th 
of an inch in diameter. R. hirsutus, pollen-grains smoothish, 
with three depressed scars, and 1th of an inch in diameter. 
2. arvensis, pollen-grains round, rough, and so much larger 
than those of the other species as to measure ;1,th of an inch 
in diameter. The roughness remains when the pollen-grains 
are treated either with dilute acids or water. 
Proceedings of the Royal Society —‘ The Croonian Lecture.” 
—Dr. Lionel 8. Beale, of King’s College, has this year been 
honoured by the office and duties of Croonian Lecturer, the 
subject of his lecture being ‘On the Ultimate Nerve-fibres 
distributed to Muscle and some other Tissues; with Observa- 
tions upon the Structure and Probable Mode of Action of a 
Nervous Mechanism.” Most of our readers will, doubtless, 
be acquainted with those various essays of Dr. Beale which 
have from time to time been noticed in these pages, and also 
those memoirs which he has communicated specially to our 
Society or Journal. The whole question is in this lecture 
reviewed, the latest researches of its author given, and a very 
firm case made out, which we should think both Professors 
Kiuihne and Kolliker combined will find it difficult to success- 
fully attack. The fact is that the whole cause of dispute 
between Dr. Beale and foreign observers is this :— Dr. 
Beale has the finest glasses in the world to work with, 
and consequently sees more, and further into these struc- 
tures, than his opponents. ‘Their differences are thus stated 
by Dr. Beale :—‘‘ With regard to the ultimate arrangement 
of nerves in muscle, the conclusions of Kolliker accord 
more nearly with my own than those of any other observer. 
Kolliker agrees witii me in the opinion that the nerve lies 
upon the external surface of the sarcolemma; but what he 
regards as ends or natural terminations I believe to be mere 
breaks or interruptions in fibres which, in their natural state, 
were prolonged continuously. And there is this further broad 
difference between foreign observers and myself, that while 
they consider that each elementary muscular fibre is very 
sparingly supplied with nerves—a very long fibre receiving a 
nervous supply at one single point only—I have been led to 
conclude that every muscular fibre is crossed by very delicate 
nerve-fibres, frequently, and at short intervals, the intervals 
varying much in different cases, but, I believe, never being of 
greater extent than the intervals between the capillary ves- 
sels.” Dr. Beale’s lecture will shortly be published sepa- 
rately, illustrated by his beautiful drawings. 
“On the Anatomy and Physiology of the Nematoids, Para- 
