﻿ILLUSTRATIONS. 



Plate Page 



1. Bolograph energy curves of the solor spectrum of 



a 60 ° glass prism 2 



II. Determination of transmission coefficients of atmos- 

 pheric water vapor by changing length of path in 



absorbing medium f> 



III. Determination of transmission coefficients of atmos- 



pheric water vapor by changing- length of path in 



absorbing medium 6 



IV. Determination of transmission coefficients of atmos- 



pheric water vapor by changing density of ab- 

 sorbent 8 



V. Determination of transmission coefficients of atmos- 

 pheric water vapor by changing density of ab- 

 sorbent 8 



VI. Genera and species of Trepostomata 18 



VII. Genera and species of Trepostomata 22 



VIII. Genera and species of Trepostomata 30 



IX. Genera and species of Trepostomata 34 



X. Genera and species of Trepostomata 36 



XI. Genera and species of Trepostomata 38 



XII. Genera and species of Trepostomata 4° 



XIII. Genera and species of Trepostomata 4 2 



XI Y. Genera and species of Trepostomata 44 



XV. Middle Devonic crinoids 84 



XVI. Middle Devonic crinoids 84 



XVII. Tonga natives making kava 89 



XVIII. Present building, Naples Zoological Station 145 



XIX. Mew of interior of Naples Zoological Station 148 



XX. Lenophyllum guttatum 159 



XXI. Massive collars 186 



XXII. Slender collars 186 



XXIII. Tripointed stone of the first type ( side view) 186 



XXIIIA. Tripointed stone of the first type (top view) .... 186 



XXIV. Tripointed stones of the second type 186 



XXV. Tripointed stones of the third type 186 



XXYL Tripointed stones of the fourth type 186 



XXVII. Elbow stones 186 



