CORRESPONDENCE. 
51 
America, and Europe. Next follows (pp. 106-115) an account of the 
Polycystine formation of Barbadoes, describing 278 Polycystina, and 
about 20 “ Poly gastrica ” and 70 other forms, including Phytoliths, 
Geoliths, a few Foraminifera (pi. 1, fig. 1, Planorbulina ; fig. 2, Dis- 
corbina ? barbadensis, Ehr. sp.), and some inorganic particles ; and at 
pp. 116-120 the Polycystines and other small organisms (156 in all) 
of the Nicobar Islands. These are illustrated by thirty quarto plates, 
delicately drawn and tinted. Remarks on the Chalk marble of 
Antrim and white marl of Lubin (Poland) succeed ; and notes follow 
on some of the statistics of the Table, — on the fresh-water and volcanic 
materials yielding Diatomacecc, — on the economic use of microscopic 
organisms, — and on the systematic classification of Polycystina. An 
extensive synoptical Table (pp. 170-225) of the minute organisms 
found in fresh-water and volcanic materials in all parts of the world 
concludes this work. Chiefly “ Poly gastrica ” are here enumerated, 
with some Phytoliths, Zeoliths, one Polycystine, twelve “ Poly- 
thalamia,” a small Mollusc, two Entomostraca ( Cypris Haguei and 
C. Mexicana), and some miscellaneous particles. 
To few is it given to gather together before death their gleanings 
of knowledge, industriously sought for during the midday of working 
life, and to harvest their sheaves in such noble volumes as the 
‘ Infusionsthierchen ’ of 1830, the ‘ Mikrogeologie ’ of 1854, and the 
synoptical memoirs of 1873 and 1875. The strong constitution which 
withstood the sufferings and dangers of Eastern travel, to which his 
companion, Hemprich, succumbed, sustained Ehrenberg to a ripe old 
age ; and the valuable recognition of his genius by A. von Humboldt 
and his sovereign, and the fortunate sympathy of an intellectual home 
and scientific society, fostered and encouraged his patient persistence 
in the gathering of facts from the minutest and most manifold of 
organisms both of sea and land. We can now see at a glance, in the 
beautifully exact plates he has set before us, group upon group of the 
myriad atoms, once endowed with life, and impressed distinctly with 
Nature’s seal of rank and order, which range from almost nothing to 
the greater things, — and between far-past ages and the present. And 
thus he still helps others to fulfil their duty and reap their pleasure in 
the fields of Nature (as he himself has done), — interpreting her 
mysteries, and applying their hard-earned knowledge to the benefit of 
mankind. 
I remain, Sir, yours, &c., 
T. Rupert Jones. 
