Reviews and Book Notices. 197 
of our readers. A. is the side of a large slate cistern, in which 
is a fountain. B. is a. cylindrical cistern of lead, from the bottom 
of which, at E., projects a syphon C., the other extremity of 
which is carried down the garden for a distance of fifteen yards 
to a stone well D., the outlet of which is then at F.  B. is 
supplied with water from the tap shown. This tap’ has to be 
regulated to give a certain supply. As the cistern B. gets filled 
with water to the level of the dotted line it is filling the right 
51 
seh 
limb of the syphon also. When the water has risen to the 
dotted line, all air being driven from the tube, the action of the 
syphon begins, and as the base of the syphon pipe is greater 
than that of the tap, the water in B. is drawn off until it falls 
down to E., when air gets into the syphon and stops its action 
until the cistern B. is again filled from the tap. When the 
syphon is drawing all the water from B. it is flowing into the 
well D., and is, of course, emptying itself during the time that 
B. is again being filled. 
—_2e—— 
The Kingdom of Man, by E. Ray Lankester, D.Sc., F.R.S., ete. 
Constable & Co., 1907. 192 pp., plates, 3/6 net. This volume contains 
three essays by Professor Lankester, which, under other titles, have 
previously appeared elsewhere. The first, ‘ Nature’s Insurgent Son,’ was 
the Romanes lecture for 1905; the second was the presidential address of 
the British Association, delivered at the York meeting last year, and contains 
an account ‘of the progress made in the last quarter of a century towards 
the assumption of his kingship by slowly-moving man.’ This address was 
dealt with in these columns at the time it was delivered. The third paper, 
reprinted from the ‘Quarterly Review,’ is an account of the recent attempt to 
deal with the Sleeping Sickness of South Africa, The volume takes its title 
from the first of the essays named. All three will be familiar to our readers, 
though many may desire to possess them in this convient form, particularly 
as numerous additional illustrations are inserted. We notice, ina description 
of a photograph of six Eoliths of the ‘shoulder-of-mutton’ type, ‘the 
descriptive term ‘‘trinacrial”’ is suggested by me for these flints in allusion 
to the form of the island of Sicily which they resemble (Original).’ Future 
writers please note. 
1907 June 1. 
