NATURAL HISTORY MISCELLANY. 381 
almost entirely by the chase. The proverbial stature of the Pat- 
agonians was so far confirmed by the observation that the Tehuel- 
ches give an average height of five feet ten inches, with a corre- 
sponding breadth of shoulders and muscular development; the 
Manzaneros come next in order of height and strength, the Pam- 
pas being the smallest of the three races. The Manzaneros are 
remarkable for their fair complexions, while the Tehuelches are, 
literally speaking, Red Indians. Lieut. Musters had visited all 
the various tribes of those races, from the Rio Negro to the Straits 
of Magellan, for political purposes, and he estimated the popula- 
tion, which he described as diminishing, as follows :—Tehuelches 
1,400 to 1,500, Pampas 600, and the remainder Manzaneros, 
amounting in all to about 3,000.— Nature. 
MICROSCOPY. 
Tar Foor or Dytiscus anb THe Fry.— Mr. B. T. Lowne (in 
a paper read before the Royal Microscopical Society, London, 
May 3, 1871), gives a very interesting and conclusive study of 
this familiar and interesting object. The tarsi of the anterior feet 
of the males are furnished with some two hundred sucker-like 
disks, one of which is about one-sixteenth of an inch wide, another 
a thirty-second of an inch, and the rest one hundred and fiftieth 
of an inch each. These disks, more properly called pulvilli, are 
evidently designed for purposes of adhesion, and being believed 
by the majority of persons to act by atmospheric pressure, are 
popularly called suckers. They are evidently comparable to the 
pulvilli of many insects. The tarsi of some diamond beetles are ' 
furnished with tubular, bulbous hairs whose bases open into a 
gland in the tarsus, a viscid fluid from which fills the hair and 
exudes through the walls of the bulb. In flies the same structure 
is found, except that the minute organs are furnished, instead of 
bulbs, with flattened disks, which, by bearing an equal strain sup- 
port the individual, though they are easily removed from their 
attachment by the insect, which separates one row at atime. In 
the male Dytiscus we observe an extraordinary modification of the 
same organs; the tarsus being mainly occupied by a large, glan- 
dular sac, into which open, by apertures visible under the micro- 
scope, the columella of the so-called suckers. ‘These ‘‘ suckers” 
are disk-bearing hairs, greatly modified in size but little in struct- 
