326 



on the above-mentioned proposition^, the author concludes his paper 

 with the following sentence : — 



" The several partial theories of philosophers, as far oji 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 theor}" of the emission of light, the 

 undulator}^ theory, and ven;- 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 Mvriapoda." Bv Georsre Newport, Esq. Communicated bv 

 P. M. Roget, M.D., Sec. R.S7 



The author commences his paper by stating that great interest 

 attaches to the study of the ]\Iyriapoda, from the Edready known fact 

 that their mode of developement, by an increa.5e 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 ]\Iyriapoda 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 examinarions 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 part5 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 be has not been able to follow 

 out the organs to their fullest extent. In the fema-le, he shows that 

 the oviduct described b}' Tre^-iranus is covered by an immense num- 

 ber of o^dsacs, each secreting only a single ovum ; that many hun- 

 dreds of these exist around the duct, a large proportion of which 

 never reach maturit}^ being retarded in their growth by the deve- 

 lopement of others immediately around them : and that the ova, when 

 matured, are passed fi"om 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- 



i 



