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ciple of aiionuiloiis (lispcisiiui opens a wav lo accomit tor llie cou- 

 iiection liciweeii solar pliciioiiieiia and terivsirial distiii-ltaiR'e.s. 



There is a strikiu'^- feature in liie manifestations of solar intlnence 

 on nieteorologieal and earfli-nia»'-nelic elements, wliieli it is es|)e('iall y 

 diflicidt to explain 1»\ oilier i)riiu'iples, namely the eirenmstanee that 

 this cosmical iidliience does not alfeel the illuminated hemisphei'e 

 nniformlv. I)iil often apjiears to act \ariously on ditferent regions of 

 the Earth, although the solar parallax is only 8.8" 



This j)eeuliarity of the solar intliienee, as well as the divers perio- 

 dicities ol)serve(l in the variations of meteorological and magnetic 

 elemiMits, may he readily explained as consequences of the iri'egulari- 

 ties of the solar radiation Held, which in their tin-n are caused by 

 surfaces of discontinuity. 



( )ur aim has Iteen also to show, thai cww when supjtosing the 

 solar output to he constant, periodical allcrati(uis in the freipiency 

 of spots, taeniae and prominences and in the appearance of widened 

 spectral lines must result from the mere change of the Kai'tlfs position 

 relatixe to oni* rotating luminary. The Tl-year period, especially, 

 seems to follow as a naliii'al con>('(|Ucnc(' tVom these consideratiojis. 



It may he that we ha\e loiudied here the only eflicient cause of 

 the periodicities noticed and that there really remains no ground 

 for the admissi(Mi of a \arial>le solar acli\ ily. This latter inference we 

 have, however, noi proxed, hut foi' the sake of argument taken 

 for o-raiited. 



Zoology. — "7'//^' inncfss of involution of tJtr nmcon.'i mrmhrmie of 

 tlii' uterus iif' "Diisius sjii't-truiu af'trr pi/i'turition." By Prof. 

 Hans Stkaiii, of (iiessen. (Communicated hy Prof. J. D. van 

 UKR Waals, on helialf of Prof. A. A. W. Hubrkcht). 



I am indebted to Professor Hlbhkcht for some exceedingly interesting 

 specimens of uteri of Tarsius spectrum, which enable me to throw 

 some further light on the different phases of the process of itivolntion 

 gone through by the uterus during this animal's puerperal period. 



This material was especially valuable as I had an 0])[»ortunity, on 

 previous occasions, of examining the same process in a series of 

 other mammalia, and I am no^v enabled to determine how far Tarsius 

 agrees with the forms hitherto under observation, and where it differs 

 from them. 



I had a considerable number of uteri at my disposal, some from the 



