Essential unlikely to be provided by chemist?

Usage examples of indispensable.

A bath was an indispensable step in the mysteries of Mithras, the initiation at Eleusis, the meda worship of the Algonkins, the Busk of the Creeks, the ceremonials of religion everywhere.

When experiments on animals seemed to him absolutely indispensable, he had recourse to them, but always with repugnance, and with desire to avoid giving of pain.

Experiments on animals are in no way indispensable to completely efficacious instruction in physiology.

In the discovery of anaesthesia, general and local, painful experiment on animals has played no indispensable part whatever.

Athens, 1914, is still indispensable for the study of the coins of Antinous, for which it offers the only attempt, to date, in complete cataloguing and analysis.

The question has often been asked why the Navy was so unprovided with these indispensable small craft for antisubmarine warfare.

I call it this because of its similarity to a living cell, with a nucleus containing the most important and invaluable components, surrounded by areas of less importance, but indispensable nonetheless.

Without being actually afraid of mice, Theodoric classed them among the coarser incidents of life, and considered that Providence, with a little exercise of moral courage, might long ago have recognised that they were not indispensable, and have withdrawn them from circulation.

When, in March, and May, and July, 1862, I made earnest and successive appeals to the Border States to favor compensated emancipation, I believed the indispensable necessity for military emancipation and arming the blacks would come, unless averted by that measure.

A compradore, usually a well born Eurasian, was the indispensable go-between betwixt European and Chinese traders, who could speak fluent English and Chinese dialects, and to whose hands at least ten percent of all transactions stuck.

And yet to both these parties a box at the opera is as indispensable as to the finished courtezan, who here spreads her seductive lures to catch the eye, and inveigle the heart of the inexperienced and unwary.

Mycroft draws four hundred and fifty pounds a year, remains a subordinate, has no ambitions of any kind, will receive neither honour nor title, but remains the most indispensable man in the country.

Its larger significance, its greater meaning, Eccles takes to be this: suffering, deprivation, barrenness, hardship, lack are all an indispensable part of the education, the initiation, as it were, of any of those who would follow Jesus Christ.

In the proposition, all the functions of language are led back to the three elements that alone are indispensable to the formation of a proposition: the subject, the predicate, and the link between them.

Not that Claudius himself was so indispensable, he knew, but an Empire ruled by a palace whore and that vain and limited Gaius Silius, a pretty youth who spoke too often and too grandiloquently in the Senate, would surely court disaster.