i So- Qf the Louse. 
little black Particles pafs downwards to the 
Anus % . 
If a Loufe be placed on its Back -j-, two 
bloody darkifh Spots appear ; the larger in 
the Middle of the Body, and the leffer to¬ 
wards the Tail. In the larger Spot a white 
Film or Bladder contracts and dilates up¬ 
wards and downwards from the Head to¬ 
wards the Tail; the Pulfe of which is fol¬ 
lowed by a Pulfe . of the dark bloody Spot, 
in or over which the white Bladder feems 
to lie. This: Motion of Syftole and Diaftole 
is feen beft when the Loufe grows weak. 
The white pulling Bladder feems to be the 
Heart, for on pricking it the Loufe inflantly 
dies. In a large Loufe the Puliation may be 
feen in the Back, but the white Film not 
without turning the Belly upwards. The 
lower darkifh Spot Dr. Harvey conjectured 
to-be the Excrements in the Guts. 
Lice are not Hermaphrodites , as has er~ 
roneoufly been imagined, but Male and 
Female. Mr. Leeuwenhoek difcovered 
that the Males have J Stings in their Tails, 
but the Females none ; and fuppofes the 
fmarting Pain they fometimes • give arifes 
from their Stinging, when made uneafy by 
* Vid. Pbilofoph. Tran fad. Numb. 102, 
f Vid. Dr. Power’s Qbferv. g, 
| Arc. Nat . Tom. II. p, 77. 
PrefTure 
