history and experiments as we want, and that without these the interpretation of nature cannot be accomplished; and that therefore it is enough for me if I do my part in setting the thing on foot ?

For the sake of clearness and order, some introductions to the inquiries are submitted by way of prefaces. Likewise, lest the inquiries should be too abrupt, transitional paragraphs and links are inserted.

For use, some reminders concerning practice are suggested.

To rouse human industry, a list of desiderata, with their approximations, is proposed.

I am well aware that sometimes the inquiries are so mixed up with one another that some of the things inquired fall under different titles. But my method shall be, as far as possible, to avoid the weariness of repetitions and the inconveniences of rejections; yet (when it is necessary) ever to hold these as nothing in comparison to clearness of explanation in an argument of such obscurity.

Such then is the rule and plan of the alphabet. May God the Maker, the Preserver, the Renewer of the universe, of his love and compassion to man protect. and guide this work, both in its ascent to His glory, and in its descent to the good of man, through His only Son, God with us.

END OF VOL. IX.

CAMBRIDGE: PRINTED BY H. 0. HOUGHTON.