336 



Researches on Solar Physics. 



[Apr. 30, 



established, and drove the lymph onward in its turn. Systole of the heart 

 now again ensuing, the lymph-stream propelled into the vein swept forward 

 the blood in that vessel as before, whilst the flow of blood from behind 

 was arrested ; and so the same series of phenomena was repeated. 



It was thus seen that the phenomena attending the propulsion of lymph 

 from the anterior lymphatic hearts of the frog into the veins at their 

 posterior border, with which they communicate by a valvular opening, are 

 essentially similar to those attending the propulsion of the lymph from the 

 caudal heart of the eel into the caudal vein. 



The vein at the posterior border of the heart, after receiving the lymph, 

 turned behind the large transverse process of the third vertebra, and passed 

 forwards along the inner to the anterior border of the heart, where it inos- 

 culated with the large blackish vein which runs up on the side of the neck. 



This large blackish vein was described by Professor Johannes Miiller as 

 issuing from the heart ; but the author has not found it to do so. It is 

 merely in close connexion, so that it is dragged backwards by communica- 

 tion of the movement of the heart in contracting, and recoils forwards into 

 its previous position when diastole takes place. 



III. Researches on Solar Physics. Heliographical Positions and 

 Areas of Sun-spots observed with the Kew Photoheliograph 

 during the years 1862 and 1863.'' By Warren De la Rue, 

 Ph.D., F.R.S., F.R.A.S., Balfour Stewart, LL.D., F.R.S., 

 F.R.A.S. (Superintendent of the Kew Observatory), and Ben- 

 jamin LoEWY, F.R.A.S. Received March 31, 1868. 



(xibstract.) 



In this paper the sun-pictures taken by the Kew photoheliograph for 

 the years 1862 and 1863 are discussed; the heliographic latitude and longi- 

 tude of every spot is given, and the area of each group on each day when 

 it was observed is expressed in millionth parts of the sun's whole hemi- 

 sphereal area. The Kew photoheliograph itself, as well as the instrument 

 invented by Mr. De la Rue for measuring sun-pictures, have been already 

 described by Mr. De la Rue in the Bakerian Lecture for 1862. These 

 descriptions are not therefore repeated in this paper ; but, on the other hand, 

 the method by which the heliographic position of spots is deduced from 

 the measurements made is given at considerable length. 



The results of succeeding years, and their final discussion with reference 

 to the sun's elements, will be pubHshed hereafter. 



