C I 3 I ] 
Fig. III. is a View of the Mouth open’d tofhesv, 
a, the Skin of the Floor of the Mouth, as at b in 
Fig. II. 
b, the Tongue. 
cc , the external Teeth in the upper and under Jaws* 
for holding the Prey. 
del, the correfponding Clutters of Teeth in the inner 
cartilaginous Jaw, for Maftication, and tearing the 
Prey. 
ee, the Riel us oris, f the upper Jaw. g, the En- 
trance into the guU and branchial Holes. 
Fig. IV. is a fuil View of the Opening into the 
Marfupium , lying under the Fin d. 
VIII. Obfervations on the Height to which 
Rockets afcend\ by Mr. Benjamin Robins 
R R. S. 
May 4. ^ ¥^HE Ufe of Rockets is, or may be, fo 
-/49- confiderable in determining the Pofi- 
tion of diftant Places to each other, and in givihgSignak 
for naval or military Purpoles, that I thought it worth 
while to examine what Height they ufually rife to, 
the better to determine the Extent of the Country, 
through which 'they can be feen. I therefore, at the 
Exhibition of the late Fire-works, ddir’d a Friend of 
mine, who I knew intended to be only a .diftant 
Spe&ator, to obferve the Angle of Elevation to 
which the greateft Part of them rofe, and likewife 
the Angle made by the Rocket or Rockets, which 
Ihould rife the higheft of all. 
R % M 7 
