326 
on the above-mentioned propositions, the author concludes his paper 
with the following sentence : — 
“ The several partial theories of philosophers, as far as concerns 
the leading facts on which they are based, are contained in the sim- 
ple principles here developed : thus, the theory of universal gravity 
is here carried out to its ultimatum ; Newton and Boscovich’s theo- 
ries of alternate attractions and repulsions are derived from facts 
which depend on the alternate atmospheres, and neutral spaces of 
tenacious atoms ; Sir Humphry Davy’s theory of electrical energies. 
Dr. Dalton’s atomic theory, and the theory of the diffusion of gases. 
Dr. Black’s theory of latent heat, Gay-Lussac’s theory of volumes, 
Newton’s theory of light, or the theory of the emission of light, the 
undulatory theory, and very many others are here united in the 
most simple principles, which are, therefore, strongly recommended 
to the notice of philosophers.” 
6. “ On the Organs of Reproduction, and on the Developement 
of the Myriapoda.” By George Newport, Esq. Communicated by 
P. M Roget, M.D., Sec. R.S. 
The author commences his paper by stating that great interest 
attaches to the study of the Myriapoda, from the already known fact 
that their mode of developement, by an increase in the number of 
segments, is directly the reverse of that of true insects in which 
the developement of the perfect individual is accompanied by an ap- 
parent diminution in the number of these parts. He remarks, that 
although the developement of the Myriapoda has already been ex- 
amined by several eminent naturalists, such as Degeer, Savi, Gervais, 
and Waga, some of the most important facts relating to it have, 
nevertheless, escaped their notice, and he proposes, therefore, to lay 
before the Society the result of his own investigations on this sub- 
ject, and also his examinations of the organs of reproduction. 
The paper is divided into four sections. In the first, the author 
describes the organs of reproduction, and shows that the parts de- 
scribed by Treviranus, both in the male and female Julus, are only 
the efferential ducts in the male, and the oviduct in the female ; 
that in the former there are developed, from the sides of the efferen- 
tial ducts, a large number of sacs, the structure of which he de- 
scribes, and states his opinion that these are the proper secretory 
organs in the male, but remarks that he has not been able to follow 
out the organs to their fullest extent. In the female, he shows that 
the oviduct described by Treviranus is covered by an immense num- 
ber of ovisacs, each secreting only a single ovum ; that many hun- 
dreds of these exist around the duct, a large proportion of which 
never reach maturity, being retarded in their growth by the deve- 
lopement of others immediately around them ; and that the ova, when 
matured, are passed from the ovisacs into the duct, and are then all 
deposited at one time. He adverts especially to the remarkable condi- 
tion of the female oviduct being a single organ, throughout the 
greater part of its extent, but having a double outlet ; and shows its 
analogy in the internal portion of the organs to those of some in- 
