78 HAECKEL: HIS LIFE, WORK, AND COMPANIONS 
minute holes, through which in life the amzboidal almost 
structtireless animal protrudes Jong hair-like threads of its 
substance, after the manner of the sun animalcule, 
actinophrys sol, common in fresh water. They were 
first found by Ehrenberg in the North Sea, were called by 
him polycistina, and were afterwards re-named by Mueller 
radiolaria. They have been found in many seas, and in a 
fossil state in various parts of the world. The Barbadoes 
earth, well known to microscopists, has them in abundance 
in many forms, all of which are of exquisite beauty. 
Before the year 1859 Haeckel knew but little about these 
tiny forms of life ; but by the following year he had dis- 
covered one hundred and forty-four new species. In the 
September of that year he read a paper about them at the 
Scientific Conference at Koningsburg ; and in 1862 he pub- 
lished his Monograph ‘‘ Die Radiolarian,’’ in a sumptuous 
folio volume of nearly six hundred pages, with a second 
volume of thirty-five descriptive plates, from his own 
beantiful drawings. 
Study of the radiolaria occupied no small fraction of 
Haeckel’s life. The value of his work is best seen from 
his report of these forms of life for the British government. 
As is well known, the British ship Challenger, from 1872 
to 1876, made a voyage for exploration of the deep sea. 
With the best appliances ooze was brought up from the 
bottom of the ocean from nearly four hundred places. Some 
of these spots were more than a mile below the surface of 
the sea. The results of that voyage are embodied in fifty 
quarto volumes, sold at £100. Of these volumes four- 
fifths—forty volumes—are Natural History reports by men 
of unquestioned ability. Besides some other forms of life 
brought home by the Challenger, all the radiolaria dredged 
from the deep sea were entrusted to Haeckel for examina: 
tion, classification and description He devoted ten years 
to the task. His report isin English. It fills two volumes 
comprising 2,750 pages, with 140 large plates. When the 
